New Peace, Bust Half, And Seated Half Additions! & Question

Acetone (pure) will do the trick. It melts away tape better than anything else and will not react to the metal. Take an after picture and post it for the group.

P.S. Any ideas on grade for these elderly ladies?

Although acetone is the proper solution for the tape residue, consider carefully what a successful removal will do to the look of the surfaces. If the coin acquired patina at different rates in the areas not covered by tape, the resulting surface will be "splotchy" in the opposite direction, and possibly even uglier. This is a general statement, intended for the broader readership, and I'm thinking it doesn't apply in your specific case here. And if acetone doesn't remove those black dots from the 1921, leave it alone. Heck, it's a valuable coin - maybe leave it alone anyway.

Grading? Small pictures force nonspecific opinion, so that's what I'll offer:

1921: High EF - low AU

1922: A true "slider." I'd be more comfortable deciding whether or not it's Mint State with larger images.

1828: F15-ish, maybe VF20.

1838: A little better than the 1828.

1855: Wish I could see LIBERTY better. The rest of the coin is in the VF range.

In my estimation, you did well for the price. All the coins look "original" enough to warrant the money you offered. Just don't apply any friction to the half as you attempt to get the glue off, just simply acetone dip it.