Virginia trustee sales are conducted under the state's non-judicial foreclosure process, which means there is no court involved. The trustee, typically a law firm or title company appointed by the lender, runs the auction, and the rules are set by that trustee, not a unified county system. That matters because the pre-registration requirements vary by trustee, and some do require you to pre-register while others only ask for the cashier's check and ID at the steps.
The clerk's office gave you the floor-level answer, which is accurate as far as it goes. The step they may not have mentioned: contact the specific trustee handling each sale you want to bid on, and ask them directly whether they require a bidder registration form, a deposit amount pre-specified by them rather than the opening bid, or any entity documentation if you are bidding under an LLC or corporation.
On entity paperwork, this is where people do run into problems. If you plan to take title in a business name rather than your own name, many Virginia trustees will want to see the entity's authorization documents, meaning an operating agreement excerpt or a corporate resolution showing you are authorized to bind the entity. Some trustees ask for that on the day. Others want it submitted beforehand. Getting caught without it when the gavel comes down can mean forfeiting your deposit.
Your $60k liquid is relevant here too. Most Virginia trustee sales require the full purchase price in certified funds on the day, not a small deposit. If the property opens above what you can cover, you cannot bid up and pay later. Knowing your ceiling before you get there protects you.
I would confirm the specific trustee's requirements at least a week out, and if you are bidding as an entity, have your authorization paperwork notarized and ready.
Are you planning to bid in your own name or through a business entity? That changes what you need to bring.