Based on what law? This seems to be importing the concept of good faith purchase that has relevance to the transfer of title (if the buyer doesn’t have a reasonable good-faith belief that the seller has good title to the goods being sold, and the seller only has voidable title, the buyer will receive only a title voidable by whomever the seller’s title was voidable by), but outside of its domain.
There is, that I am aware of, no generally-applicable rule (e.g., under the UCC) applicable to the sale of goods in the United States where the purchaser’s doubts about the seller’s representation as to the description of the item that they were selling would prevent the formation of a sale contract and the buyer’s right to inspect, reject, and return nonconforming goods under that contract. You may be confusing reasonable belief that the seller is actually offering the goods with reasonable belief that the seller actually intends to fulfill the contract, which are different issues.
Could you cite statute or case law on point, or reference a work which does?