Application successful but Home Office didn't retain BRP by mistake

[SSE1992]

Hello,

Hopefully someone can give me advice.
I've received a letter saying my application is successful. In my application I selected 'YES' for the Home Office to Retain my BRP.
But they returned the BRP back to me, the return is acknowledged in their letter.

I plan to send the BRP back to them before 5 days after the ceremony. Is this okay? (as long as it's not something illegal)
Or should I return this ASAP and mention there was an error?

[alterhase58]

Just return it to the address quoted - that's not for correspondence. Don't think there's any need for correspondence around this.

[mrgs1]

Mistakes happen there only human!