Auction viewing question

This is a newbie auction question. When wanting to view coins before an auction are they displayed as a group or do you have to specifically request which lots you wish to review ? Thanks
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Comments
Some very expensive lots require a special request. The auction management must get those lots for you.
Some small auctions have the material laid out in cases, and ask to look at them. I have not been to a small auction in many years, so things might have changed there.