In most cases, use Box 1.
If you enter the amount of carryover in either the Box 1 or Box 2(a) box in TurboTax, it will show in on Form 8582 Part V column (c) Prior Years Unallowed Loss (as a total of the two boxes) and you will get credit in the current year for your prior year loss carryover.
Box 2a is described as coming from Form 1040 as "Ordinary income from recoveries," which typically relates to litigation and not specifically to rental activities.
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