I've bought 5 guns through Gunbroker with no issues whatsoever...three were described as NIB, the other two as "Mint". All were as described and I had them in my hands within 2 weeks of the auction ending. Here's my method...
I never bid on an item from a seller with a limited track record...i.e. less than 100 transactions...and I always read the reviews on his record.
I will not bid on a gun that specifies that no inspection period is allowed.
I always pay with a USPS Postal Money Order which makes any hanky-panky a Federal offense.
I only bid on items from an FFL holder and use a reliable local FFL to complete the transaction.
On winning an auction, I always call the seller the next day and firm up delivery plans.
It's worked for me...hope you have good luck. Best Regards, Rod
Our Flag does not fly because the wind blows against it,
It proudly waves because a soldier's dying breath blows upon it.
USAF Forward Air Controller, 5th Spl Forces,
An Loc, lll Corps, RVN, 69-70, Vietnam Vet '69-'73