Tex. Election Code § 51.034: SPECIFICATIONS FOR BALLOT BOXES.

(a) Each ballot box must be made of a sturdy material and suitably designed for its intended use. Each box must have a lock and key.

(b) Ballot boxes no. 1 and no. 2 must each have a slot in the top just large enough to receive a ballot. Ballot boxes no. 3 and no. 4 are not required to have a slot, but if a slot is provided, it may not be larger than that prescribed for boxes no. 1 and no. 2.

(c) A ballot box may be used without approval of the secretary of state if the box:

(1) is an enclosed, opaque container made of metal, wood, or other material;

(2) is equipped with a hinged top, hasp, and padlock; and

(3) complies with Subsection (b).

Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.