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I was thinking “self-adhesive” envelopes.

And it would probably be better to send copies printed on a black-and-white printer (no color toner at all); a story came out a few years ago about printer manufacturers adding the printer serial number in the margin of printed documents, small and “yellow”, so it would be very hard to see with the naked eye but would show under blue light.

I worked for a score of years at a large copier company's research lab. IIRC the SN/Model is encoded in the pattern yellow dots lightly dusted in all of the white areas.

Best reference for this is probably the EFF Page A quote from that page follows:

Xerox senior research fellow Peter Crean has informed us that each document identification request that Xerox's security department receives from the Secret Service is handled on a case-by-case basis, that Xerox identifies only suspected currency documents, and that identification of machines used to print pamphlets, letters, and other non-currency documents does not occur. If true, these statements are somewhat comforting, but a clear risk remains due to the absence of legislation regulating the use of the marking technology. Color printers are regularly used for anonymous printing and pamphleteering; they are an important tool of speech. Without appropriate legal protections against the misuse of identifying technologies, these long-protected forms of expression may be in danger, as the government has easy and secret ways to identify the authors, or at least the printer purchaser, of any speech printed on color printers.

For what it's worth.

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Oh, thank you, Sir! I didn’t know that at all, and it is good to know.

Yes, we can switch our printer to B&W.