Also, how can fraudulent offers be prevented in this context?

The fraudulent offer typically features a popular item or service, at a drastically reduced price.

Flush with corvine visiting cards, Rolfe took up residence in Christchurch, before the fraudulent offer he made for his hosts' house marked the end of his credit and credibility in Hampshire.

Those were in Russia; but in addition the German authorities uncovered 267 cases involving either indirect traffic or fraudulent offers to sell nuclear substances in 1994, the most spectacular being the seizure of plutonium in Munich of course.

Information may be obtained from insiders (such as dishonest bank or government employees), by fraudulent offers for employment or investments (in which the victim is asked for a long list of personal information) or by sending forged bank or taxation correspondence.