It's a Kenner US box from 1983. It all looks vintage to my eyes, it doesn't look like new tape has been laid on top so I don't think it's a reseal. The old tape looks to have dried off but the seal on the cardboard flaps has held (and yes is probably fragile). If the flaps were open and it was a mint NRFB example then I would value it at £300 - £350, but if you had it graded as a sealed example then that value would probably be closer to £1300 imho (I don't have a huge experience in values of graded items and others might have a better idea on £). I dont normally advocate grading but with the dried tape this is kinda a 'grey area' so definitely worth sending UKG an email imho and looking seriously at grading it as sealed if they are willing to do so.