Actually the redemption requirements don't apply to No Cash Value chips

12.090 Promotional and tournament chips and tokens.
1. As used in this section, "promotional chip" means a chip- or token-like object issued by a
licensee for use in promotions or tournaments at the licensee's gaming establishment.
2. Promotional chips must be designed, manufactured, approved, and used in accordance
with the provisions of this regulation applicable to chips and tokens, except as follows:
(a) Promotional chips must be of such shape and size and have such other specifications as
the chairman may approve or require;
(b) Each side of each promotional chip must conspicuously bear the inscription "No Cash
Value";
(c) Promotional chips must not be used, and licensees shall not permit their use, in
transactions other than the promotions or tournaments for which they are issued; and
(d) The provisions of section 12.070 of this regulation shall not apply to promotional chips.
(Adopted: 6/87.)

section 12.070 is the section that sets out the requirements for discontinuing the use of chips, so it would appear that the gaming regulations allow the discontinuance of No Cash Value chips with absolutely no notice.