He should wait until the owner returns before selling it >.>
Orange in a phenethylamine sounds weird. Unless they didn't reduce all of the nitrostyrene and were too fucking lazy to so much as do an AB extraction... I rather doubt that; that's a level of shoddiness above and beyond even that of RC suppliers (at least the ones selling 2C's, i think the sellers of cannabinoids and meph might be a bit shoddier)
There's a lot of yellow-orange-red JWH going around. Even from a decent supplier, 18 and 73 aren't a nice white, and have a distinct mothball odor. If your guy's stuff reeks of mothballs, it's a JWH, almost certainly JWH-018.
Otherwise, its god-knows-what, and should not be ingested until it's identity is determined.
In any case, your dealer deserves a smack upside the head for offering to sell something he didnt know the identity of. And maybe from the owner of the stuff (why do i get the idea that he wasn't supposed to be selling it? maybe i'm totally off the mark here)