To process the removal orders by the Prep center you have to enter the Prep Center address in the following format in the return address field on Amazon Seller Central:
Fulfillment-BOX (name of your company)
*be sure to indicate the name of your company in brackets
For each product you can leave instructions for the processing of your returns.
After processing the returns from Amazon the status of the shipment in Ysell will be changed.
This way you will know when the returns arrived at the warehouse.
Return / Removal handling instructions are here
Instructions for working with returns are here