Have you tried calling the 800 number for a jumbo in one of the seasonal beiges or 21s pinks? Perhaps try Saks or Neimans. I've seen a few of the department store SAs posting that they're still receiving shipments (from 21S). You can try these SAs on IG or check out the recommended SA thread:
Christina Adamo - IG: christinamademedoit
Handbags & Accessories @ NM Paramus - CLOSED SUNDAYS
201-417-2848
Eddie Perez - IG: eddieluxurygoods
Saks
For reference, the last time I was in the Chicago boutique just a few weeks ago, there was one jumbo and it was from 2019 I think. If you aren't able to find one, perhaps try to get on a list for 21A for the 21A grey that's coming. Good luck!