This Murry gag was published in 1959 in Brazil:
It seems the gag was only published three years later in American comic books, in MM #82:
That is very unusual, but the exact reason for this is unknown.
Even more unusual, this Chip'n Dale gag by Phil DeLara was published in 1960 or 1961 in various countries (here are scans of the Swedish and Brazilian prints) but apparently not in the USA:
This is possibly a gag that was sheduled for Chip'n Dale (maybe #17) but eventually shelved (unless one here has an American print of it?).