who (what company) can do an inexpensive dna comparison check of 2 envelope samples for me?

both are deceased and relatives, and it’s for the purpose of genealogy. They’re in the same family so certain things should match for our line.
wendy, the fly in the ointment is why I wish to do a “comparison” of two male family members.

Familytreedna is a well known player in the genealogy and dna field. The standard type of testing for this purpose involves a cheek swap sample.
What you want, is something different since it involves different types of samples. The obvious fly in the ointment is absolute proof of WHO wrote the envelope or licked it. It raises the question of “integrity” of the sample. In other words, it may seem obvious that the writer licked the envelope.. but “obvious” is not scientific proof.
You certainly can contact one of the known companies to discuss this with them. I would be skeptical that they would try that.. and if they did, I highly doubt that it would be in the same price range as the testing commonly offered.
Just opinion and feedback.

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DNA on DNA $17.58 Previously released on CD by No More Records, now issued on a limited edition 2LP featuring newly-discovered songs exclusive to this LP: “Pompeii,” “Shrinking Thing,” “Drinking Water,” plus two encores from DNA’s final performance at CBGB’s. Definitive collection of studio and live recordings by New York’s seminal no wave band DNA. Surviving two line-ups over a brief period of four years; this highly influential, strikingly original and extremely under-recorded band left a huge void in its wake. Formed in 1978, Brazilian-raised singer/guitarist Arto Lindsay hastily assembled an international trio of non-musicians. Robin Crutchfield played keyboard and Japan’s Ikue Mori played drums. DNA played their first gig within weeks and recorded their first 7″ shortly afterwards. The ear of Brian Eno was quickly caught, recording them for the infamous No New York compilation alongside James Chance, Mars, and Teenage Jesus & The Jerks. Before No New York was released, Robin left the band after a total tenure of nine months. Bassist Tim Wright had just left Pere Ubu, relocated to NY and quickly joined DNA. With a new face, a new instrument, and a new sound, DNA recorded their classic 9-minute EP A Taste Of DNA. DNA toured the States and Europe, bringing their explosive live show to a wider audience. DNA only released 12 songs during its lifetime, and another 3 shortly afterwards on a European compilation. Their impact was far and wide-reaching. Many musicians have sited DNA as a main influence including Thurston Moore of Sonic Youth and the band Blonde Redhead, who appropriated their name from a DNA song title. This LP compiles all of the studio and many choice live recordings. Of particular interest are the original line-up’s “early versions” of “Detached,” “5:30″ and “Low” (which is closely related to “A New Low”). The unreleased studio tracks “Grapefruit,” “Police Chase” and “Young Teenagers Talk Sex” are heard here for the first time, as well as live versions of the unreleased songs “Nearing” and “Surrender.” Featuring exclusive liner notes from Byron Coley, Jason Gross and Glenn O’Brien alongside many unseen photos and flyers housed in a gatefold sleeve. Performers: Arto Lindsay – Guitar, Vocals; Ikue Mori – Drums; Robin Crutchfield – Keyboards, Vocals; Tim Wright – Guitar, Guitar (Bass)