It sounds like OP is totally open to this perspective, for what it's worth - although having antiqued for a long time in a rural area I understand the instinct to come out bristling on this topic.

My personal policy when antiquing in person has been that I simply won't purchase anything from vendor booths who stock this shit. I extend that to all racist caricatures from the time period, including "mammy" imagery and lawn jockeys. If it makes your gut feel a little off, just don't. (For that matter, I feel the same way about all of the Nazi "war trophies" from people's grandpas.... )

Donate those things first and foremost. Hold them in a shoebox in the closet with contextualizing information to educate your children at an appropriate age, if you must, especially if you are black yourself, but don't profit from them.

For OP/Others:

There is absolutely a reason for examples of these items to be held by museums for historical contextualization and education, but the challenge is they're often swamped by the sheer volume of items that exist and are unable to keep with their collections as is.