When you remove the cap, can you smell the scent? If it has been sprayed, you might be able to smell it.
Generally on eBay the attitude is, "if it's good enough to keep, it's good enough to pay full price for." You were planning to gift or resell them-- getting a few dollars back would not make these more giftable or resaleable IMO. They would still be used bottles.
Decide wheher they are good enough to keep as is. If not, ask for a full refund upon return of he product.
A personal anecdote: I bought a bottle on eBay (not Demeter) that was advertised as full and never sprayed. No box. Bottle was opaque. It was a great deal.
When it arrived, the perfume smell was strong as soon as the cap was removed. But it felt heavy, and sounded pretty full when shaken. I sprayed it once; perfume came out with the very first spritz (indicating the pump mechanism had been primed by being previously sprayed.)
I decided to keep it since it was a good deal. But this was for me, not for resale. If it were for resale, I would have returned it for a refund.