E210882 is a UL listing not a dell motherboard part number. It has to do with the FR-4 material component of the board.

There are several numbers printed directly on Mother Boards that are not indicative of board model. E210882 E253117 D33025 94V-8. 115011445A

/21 b6e1e2
115XDBP 22NH

These numbers represent regulatory or industry specification markings and cannot be used to identify your board.