Sheetrock & joint compound (castro valley)

Hello!
For a project to distract from my unemployment/job hunting woes, I started wiring up our house like we wanted. Unfortunately there are some holes in our sheetrock now due to materials inside the wall & other issues that prevented us from running the cabling in that area. The better half would like us to patch, sand, & pant back to what the wall was before. I grabbed our joint compound but it was that old and beyond usable – grey & solid.

In case you have a couple of pieces of sheetrock and some spare joint compound it would be put to good use.

TIA!