29 C.F.R. § 1470.51

The closeout of a grant does not affect:

(a) The Federal agency's right to disallow costs and recover funds on the basis of a later audit or other review;

(b) The grantee's obligation to return any funds due as a result of later refunds, corrections, or other transactions;

(c) Records retention as required in § 1470.42;

(d) Property management requirements in §§ 1470.31 and 1470.32; and

(e) Audit requirements in § 1470.26.