1928 F50 Faber and W502 Carey

[71buc]

I have this 1928 Tharp's Ice Cream Faber and a 1928 W502 Max Carey. I can find little information on them. For what it's worth the PSA population report indicates that PSA has graded one other example of each card. Are these sets rare or simply undesired? I am looking for assistance because I have been asked to include them as a part of a trade. I can find no information related to their potential value and don’t want to make a mistake. I have had these in my collection for over 25 years and do not even recall what I paid for them. Any help would be appreciated. Thanks in advance.

Mike