bad luck, mate. its pretty clear u've been robbed by the seller.
its tough to buy boxes from ebay nowadays, coz most of them are resealed boxes. off course, u're looking for cheap boxes, but its only around $10-15 and the risk is way to high.
u better buy from a good distributor (ie, dacard, orange county, sscentral). sometimes they have somthing like weekly special products.
in this case, u better talk with the seller, and give the seller neg feedback if the seller doesnt want to admitt it is a resealed box.
ps: next time if u buy box from ebay, check out the top and bottom of each pack before u open it, u can tell the difference between factory sealed and resealed pack.