Indiamart order held up asking for declaration. Fake declaration customs?

[EuropeanWarlord90]

Hey, my order from indiamart using the tringulation method sent from northern ireland to eu is held. They ask me to declare it and they need proof like an invoice or receipt. What should I do? I put the worth at 50euro maybe thats why they holding it idk, but I was thinking to just order something worth 50 then cancel and then upload the invoice. Or do you think im fucked and it will just get seized.