ya, at first they will seem fine. Stress from being housed together will show up eventually, just like stress from bad temps or from lack of security these things all show up later. Which is how alot of newer people get into trouble. They seem just fine at first.
Housing snakes together is a bad idea for record keeping, you wanna know when your snake pooped, shed and how much they drink you cant keep track of the accurately if there are 2 of them in there. It is also difficult for feeding you dont want to have to separate them eveytime they fed sometimes you just don't have time to sit around and wait for them to finish!! Being housed together will stress out your animal, reptiles are solitary animals, the only time they go searching for another of there kind is to breed then they are saying "later, have a nice day". Im sure in there cage they are laying on top of each other, so your thinking they are buddies but its really just a heat thing. Most vets don't give good advice about reptiles, unless they majored in herpetology they only get a little course in reptiles in general not specific species. You really need to search to find a good "boa" vet or a good "python" vet and sometimes that could take a really really long time or quite a drive
Good luck!! Show us pics when you get the new guy