Hi [NAME],   I will try to help. Please PM me all 3 server service tag obtained via BIOS with screenshot. Then, provide me your full name, email and the previous owner's details as much as possible. But I might not be able to respond to you in time as I'm going off duty soon. 
Greetings, I recently purchased three recycled PowerEdge r620s from Build My Server for home lab use. Two out of the three had iDRAC 7 Enterprise licenses. The one that did not was at iDRAC7 Express, but it has a iDRAC Enterprise barcode on the right side of the chassis. I requested it be transferred to my DDL account and registered it there, but still can't find the license. Anyone able to assist? Thanks
iDRAC7 Enterprise license recovery