You say everything seems fine, yes it may look good but it's what lies beneath that counts, and that is salvage.
If you went shopping for a chair that cost $100. and right next to it the identical chair $40. but the sticker said all 4 legs were broken at one point but now glued together and declared safe " THATS SALVAGE " how safe would you feel sitting on it, never mind going down the hwy at 70 mph.
To get a better understanding what you're getting yourself into buying a Salvage vehicle , read the web page " Beware buying from an auction "