I think they are generated dumps, I have myself placed 40$ in orders to try:
543805079003XXXX=13061010000074500000
543805051301XXXX=12081010000060100000
536993518121XXXX=130110125964965
421075790151XXXX=12041010000010700000
As you can see, 3 of them look generated. Tried instores and none worked for me unfortunately :S Don't know if checker killed or whatever.
As for it being valid, I think most checkers only check number + exp date, so they might say approved but the dump won't work instores.
If anyone has extra 2.50$ on V-market shop, I found CVV of bin 421075 with same exp. date as the dump I bought. If someone can buy that one and check the CVV maybe it's going to be 107 lol x)