Photos of HD4250s:
http://s003.radikal.ru/i203/1002/54/5bd235ca5e5d.jpg
http://s41.radikal.ru/i092/1002/1f/2b718ad7322b.jpg
http://s57.radikal.ru/i157/1002/2f/f82881e1c477.jpg
later, I'll give still photos with the cards. 2nd photo is bad but you can compare it with photo of HD3570s:
http://s47.radikal.ru/i116/1002/32/6f2e4cfbd7d0.jpg
All this OEM cards are from Depo Computers service center therefore there aren't any serials on it. HD3570s have other bar codes with the names and stickers with codes of this kind of cards that marks the service center.
I'm noob with photoshop and same programms and also don't know how to "change the driver string"... On HD4250s 10.1 ATI drivers established crooked therefore GPU-Z don't display catalyst version. Sorry my awful english