1099-B (Capital Gain / Loss)

Are you expecting us to pull out one of the TD Amertrade statements from clients and look up what those sections cover?  Probably easier for you to clarify what those are.

It is possible that there is no 1099-B stock sale but there are still reportable capital gain transactions for periodic disposition of fractional shares, which the brokerage uses to cover certain ETF management fees.

If you clarify what those sections are, you'd probably get a better answer.

2019 1099-B* Lines 8-9-10-11 are listed with the title SECTION 1256 Contracts.

Directly beneath is the SUMMARY OF PROCEEDS, GAINS & LOSSES etc etc

Are you saying there are no proceeds gains and losses?  Then you still must look for PUTS and CALLS which are generally listed as NOT being reported to the IRS.  While some sketchy preparers will tell you that if it's not being reported to the IRS you don't have to report it... they're wrong.  TPs are taxed on ALL income - reported to the IRS or not.  So look for the PUTS and CALLS and any other type of less frequent transaction that may be on that statement and report it.

Don't forget to ask about virtual currency like bitcoin - That may even be on the statement (I don't know, I've yet to run across any transactions of bitcoin)