Chachi, a Way˙u woman whose business is exactly that: parking for Venezuelans or Colombians leaving their vehicles while they go in the neighboring country. As it is right at the border no paperworks problems, you sign the bike out of Colombia and don't enter Venezuela. When you come back, you just enter or Venezuela or Colombia...
for bikes she puts them in a kind of locker, very safe but dusty. I have years leaving my bike there when required, for a few days up to a few months.
P.S.: and by the way it's ColOmbia.