Bidding as lender at sheriff sale - how does this actually work?

[Daniel E.]

Scenario:

- You are the lender (purchased the note while in foreclosure)

- Lender has been awarded default judgement

- Sheriff sale scheduled 6/15/18

How does it actually work when you show up for the sale? Do you just show up, say you are the lender, credit bid, and they do not make you pay? Or do you need specific documentation proving this? 

Thank you,