I edited each asset and marked them as disposed of in March 2021, and did the "Special Handling" option as mentioned previously. Do these disposed of assets still need to show a sales price at least $1.00 more than I paid for them (their Cost) to make TTX calculate the recapture correctly?
No. You have already "disposed" of them prior to the sale. You can't "sell" that which you have already disposed of an no longer have.
There are many ways to "dispose" of an asset. One way is to sell it. In such a case, when you click NO on the "Special Handling Required?" screen, you are forced to enter sales information, as it's assumed you actually sold the asset.
Now, if you read the information on the "Special Handling Required?" screen, it lists other methods of disposition that don't require sales information. You'll see there things like the asset was destroyed, lost, stolen, given away, etc. When any one of those apply, you click YES and you will not be asked for sales information. You are done with that asset forever.
