Gunbroker will not be much help for you in this matter. It was not for me twice. Both times I had to deal with it myself. One time I sicked the postal inspector on the seller who failed to understand that the postal inspector is real and his powers to deal with mail fraud are not to be taken lightly. After he/she got involved the matter was resolved with my entire money being returned by postal money order in three days. The second time I used the credit card company to get my money returned and the BATF to deal with a FFL dealer who tried to run off with my money and not deliver a gun I had paid for. They puled his FFL. It seemed that they had three other complaint after mine and they take almost a zero tolerance view when it comes to FFL and complaints. They investigate, look for reason to crack down and do so when they can or have to.