Thank you and for the M/C model confirmation. I wondered if you might be around somewhere.

Great lens - now my preferred zoom for normal APS-C work.

Just regarding the focus adjustments again, the focus point for a zoom can vary slightly over its range, so get it right at one end and it will be out at the other. I've had no issues with my 16-85 (so far!)

From the picture he posted above it looks complete, ready to slot back in. The actual SDM contacts will need removing to replace the baffle and re-inserting to complete the process.
Your best bet if you're interested in purchasing is to PM Unlocker with any concerns and to reserve the lens.
If I was looking to purchase one of these today I wouldn't hesitate in obtaining this as the 'scary' job has been done. There is little point in undoing the mod which was purely to cripple the lens from being an obvious FF lens when Pentax didn't have a FF body to use it on (and to be fair, help prevent some internal reflections to improve contrast.)
If you haven't already done so, have a read through of the thread on the USA Pentax forum I linked to above.

Just to clarify here Vic, the company is a legitimate one, only their Ama-zon account has been hacked - possibly the company had a too easy to guess password or the hijackers broke Ama-zon's security and stole the account details (as happened to TalkTalk, Yahoo, eBay etc.)

From what I understand, the original baffle was modified so Unlocker purchased a new replacement one which should be complete and slot back in if required - 5 screws and a 2 minute job!
Can't see any reason to want to have to do that though ::
I feel sure if you were to ask, he'd do it for you should you wish to purchase it from him. If though you were considering a K-1, it is a worthwhile modification to have which doesn't prevent it being backward compatible with older bodies. The mod has been done which might be more scary for some people to consider attempting in the first place!

Have they given you a postage tracking number yet? If not ask for it.
Reading that thread does make it sound a little ominous and probably worth reporting to your credit card company immediately, Ama-zon and the local police and possibly trading standards. It doesn't really sound likely you'll be getting that lens. Did you pay via the normal Ama-zon checkout system?
(Sorry to hyphenate Ama-zon each time but I don't like it coming out in red - they don't deserve the credit for that as this case exemplifies. Or is it, buy at Ama-zon and see red?)

This page on RiceHigh's blog may explain some of the anomalies of fine focussing.
The comments suggest that Pentax only support Pentax lenses with an identifiable lens ID for the Pentax F series AF lenses or later and do not test Pentax cameras with 3rd parties lenses.

Also of note is that the focus point can shift in low light and with wide aperture ( >f2.8 ) lenses.

I've a feeling that the fine adjustment system only really works properly with actual Pentax lenses unless the exif acurately recognises the lens. Often non Pentax lenses just show as something like 'Sigma or Tamron lens' which can cover multiple versions or describes the wrong lens completely. So is the lens properly recognised for what it is in the exif?

It seems a bit of an oddball really. With its release coinciding with the K-1, most folk upgrading will undoubtedly be looking to the full frame K-1 and lenses for that rather than a slower version of an APS-C 55-300mm at several times the cost of the older version and which isn't FF compatible either. As the lens only works with the K-1, K-3 II, K-S2, K-S1 and K-70, many with earlier bodies who may consider getting one are excluded from doing so anyhow.

Still strange though that there doesn't seem to be any published reviews of the lens anywhere.

It's always worth recording buildings and areas about to be redeveloped, and those developments in progress. They are great record of social change (provided they get published somewhere to be seen!)