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Of course I am not familiar with these particular "cereal box" cardboard records but I do have a few from other sources (in most cases very thin vinyl glued onto a cardboard backing, as Kevin Bresnahan says). Some that seem to have been relatively frequent here in the later 50s and early 60s are recordings by German pop singers pressed on these promo vinyl-sheet singles, with the cardboard backing of the thin vinyl providing promo messages e.g. for radio or shoe manufacturers. Usually the recordings were not linked to the products but there also were recordings made specifically with promo lyrics relating to the products. Or sometimes just providing some music as a gimmick, such as a series of promo thin-vinyl 45s by the French branch of the ESSO gas brand (Exxon to the U.S. ) covering the various regions of France, with each  45 containing traditional folk music from the respective region.  There also were "sound postcards", with the vinyl attached to a square cardboard postcard. Usually with a mixture of music and invitational messages from the place or location promoted on the postcard. Similar promo sound postcards relating, for example, to car manufacturers are very collectible with car buffs.  The oddest item I came across is a floppy thing transparent single (no cardboard backing!) titled "Engine Faults" given away with a late 50s issue of the British "Car Mechanics" monthly mag and to be played at 33 rpm. I played it only once, placing it on a real 45 for support (it sounded wobbly and decidedly lo-fi), and unfortunately it got kinked in storage since so it's probably unplayable now.    

I shall be there tomorrow, even though the forecast isn't great. I usually go in B2

With Sun Ra alumni Marshall Allen and Danny Thompson.

Johnny “Hammond” Smith “Legends of Acid Jazz” Prestige cd  

And on his own label.