Can you go to any of the record (e.g. UI policy, business rule etc) that was captured in the Update set and bring in Versions related list on the record form. In the Version related list you will find out the captured updates with Update set name under Source column. From there you can find out, if by chance that update set is not completely wiped off. 

Btw, backout updates sets still remain in retrieved update sets and do not delete from the instance.

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Thanks & Regards,
Sharjeel