The old regulations:

12.060 Use of chips and tokens.
1. Chips and tokens are solely representatives of value which evidence a debt owed to their custodian by the licensee that issued them and are not the property of anyone other than that licensee.
2. A licensee that uses chips or tokens at its gaming establishment shall:
(a) Comply with all applicable statutes, regulations, and policies of Nevada and of the United States pertaining to chips or tokens;
(b) Issue chips and tokens only to patrons of its gaming establishment and only at their request;
(c) Promptly redeem its own chips and tokens from its patrons by cash or check drawn on an account of the licensee;
(d) Post conspicuous signs at its establishment notifying patrons that federal law prohibits the use of the licensee’s tokens, that state law prohibits the use of the licensee’s chips, outside the establishment for any monetary purpose whatever, and that the chips and tokens issued by the licensee are the property of the licensee, only; and
(e) Take reasonable steps, including examining chips and tokens and segregating those issued by other licensees to prevent the issuance to its patrons of chips and tokens issued by another licensee.
3. A licensee shall not accept chips or tokens as payment for any goods or services offered at the licensee’s gaming establishment with the exception of the specific use for which the chips or tokens were issued, and shall not give chips or tokens as change in any other transaction.

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These have been in force for years and years.