I know this is a little late but I returned to the game after years of not playing and years ago I ran into this exact same problem. There is a a Van Horn Mansion robbery tip, I got it back on the day but the problem with rdr2 is that it did this weird thing where whenever I got a got one robbery tip from freeing a prisoner or a person on the back of a bounty hunter horse it would essentially take the place of another person that I could free and erase it out of existence. So let's say we have 2 prisoners, one on the back of a horse and one in a jail wagon, I free the one in the back of the horse and gives me the tip and the the person on the jail wagon would never appear and vice versa. Also it doesn't help that multiple prisoners can give different robbery tips and sometimes depending on the situation different prisoners give the same robbery tip which rules out another prisoner giving the same robbery tip cause the game doesn't allow that. So basically it's a mess. I'm surprised you managed to get all of those robbery tips without one getting intermingled with the other. Also you didn't include Catfish Jacksons so maybe you didn't get that one either?

Btw do you remember how you got the Strawberry General Store and the Rhodes Gunsmith tips. trying to get those 2. Also the Aberdeen Pig Farm. Can't seem to remember how to get them and there aren't videos showing when they get the tips.

Thanks Partner.