reagan
hey, they're only Zorkis
If it was a true CLA, they would tell you:
a. exactly WHY the camera needed it in the first place
b. what work was performed
c. what parts were replaced
A $30 film camera from the 1960's in a suburb of St. Petersburg is taken out of a drawer, dusted off, and put on eBay. Sorry to break it to you, but THAT'S a Russian CLA.
I like to laugh at Zorkis and the guys that sell 'em, but I think we're gettin' a little harsh here. Actually, the WHY question is answered by your own description. It's a $30 camera, it's 50 years old and it's been sitting for a long time. That's a good enough reason for any camera to warrant a CLA.
I wasn't aware that Russian Ebayers are held to a different standard than sellers from other countries, i.e. the US. I can't recall ever seeing anyone with a recently CLA'd camera For Sale, here or the Bay, advertise why and exactly what work was done with a parts list attached. Could be wrong since I don't window shop a lot, but I don't recall one. Ever.
I've read, "My M3 just had a recent service by *insert well-known name here* and that's usually about it. And generally, I assume all the work was done. The same way Tex assumed his seller was honest. I've certainly no reason to doubt him any more than other sellers on this side of the pond. The terms "CLA" and "RARE" and "MINT" are all over-used. It's not a Russian or Ukrainian thing. It's an EBAY thing.
A "dusting off" as you say, isn't a Russian CLA. I've had 4 cameras cleaned, lubricated and adjusted in Russia with no regrets or complaints. Some repair work done too. A good job, each one.
Good luck texchappy. You should like the Z.4 just fine. (It and the next 5 you buy.) ;-)