Paypal got Limited

Laterly,my paypal got limited because I sold some items on ebay within 1 month. my paypal have $2000us dollars from customers .Now, they asked me for supplier info/invoices which I am not able to provide for them.

Anyone has any tip for me to resolutions this problems? I apprecited for any helps.

You can say that you purchased them at yard sales & did not get a receipt or that the items were gifts to you.