I have a problem. I fulfilled all requirements to get those 5 books and you sent them to me. But my customs stopped them and are requiring to send an invoice, because there isn't any in the package as I understood.

What should I do?

Slip customs 20 rubles or 20 whatever the local currency is.

when they ask you if you're declaring anything, don't say "war".

If I could get some serious answers, that would be nice

what country are you from?

Lithuania

ahhh... then you need to give them about 80 litai.

Or you could just let them have your younger sister for a half hour or so, dont think they would have any problems after that

Say that there is no invoice because it is a gift? Or that you won the books?

They say, that package is not marked as a gift

Uncle David is old. He must have forgotten

4 days passed since I created this thread and still not even single one useful reply. Who should I contact from twoplustwo to get a NORMAL reply?

you can send the support an email...

What is their e-mail?

i tatooed their email on your younger sisters left tittie. Hope you dont have too much trouble finding it