You mean you've got Wednesday paired with AIMB Sunday?
What I do when SWMBO gives me a pile of single socks to put away is to pick the pairs out at the time, and keep any unpaired ones in another drawer. Then when I get the next stack, after the pairing up I see if any of the left-overs match the previous set of left-overs. That usually does the trick mostly, and any still left over get stored again for next time.