Fortunately, for general stuff like this you can just buy a few reference resistors that cover the range you want to measure. This can be used as a means to cross check any results if there is any concern about calibration.
For example I just checked some of these tiny SMD 0.499R 1% resistors and the indicated result was within 0.002R on two meters so that was good enough for me.
https://uk.farnell.com/vishay/rcwe06...1-w/dp/2518233
Buying a pack of precision resistors would cost very little and this should offer high confidence when used as an in house check/calibration.
I would expect to have much lower confidence in the indicated result if all I had to go on was a cal certificate from a recent calibration of the 4 wire meter. Even if it was formally calibrated every day I'd still favour the cross check with a precision 0.1 ohm resistor.