Re bidding online or by 'phone; great idea if you have seen and held the lots but cannot be there for the sale but anyone who bids blind for old or classic tools deserves whatever they get!
It is not unheard of for valuable bits and bobs to 'migrate' across lots or even magically leave the sale room before during and after the bidding.
Whenever I buy a pricey lot I have it placed behind the rostrum at once; salerooms are set up for this and it is normal practice.
Old tools need such careful scrutiny as things like chipped mouths and cracked castings are never mentioned in the listings.
Buyer Beware! as always.
Cheers,
Martin (who goes to the odd auction now and then)