Scammed on used LT 2008?

Hi All.

I went three laptops in December (long story) and when I returned the second one my Autocad LT 2008 disk went back with it (joy).  No luck getting it back - so, I start looking for a used disk to go with my license number.

I find one on Amazon for $375 - "full commercial version with unactivated license number".

Well, I got it today and it all seems wrong.  First off - I was actually sent "Autocad 2008" (not LT) and I was like "Yay".  Then I flip it over and it looks like a burned copy (i.e. reddish, can see written area).  Then there is this note inside instructing me to use the portable license utility and email them my computer ID code and they will send me a license number.... huh?

Am I overthinking this or is it as fishy as it seems.  I haven't used the license utility in a while so I can't wrap my head around the angle here.

Thanks in advance for any help.