Sorry about your loss. I think KEH will email you when they get another hood. Talk to them. Ask them to send you an email when they have a hood.
In the meantime, if you can find an inexpensive folding rubber hood with 82mm threads, try it. If the hood is too long, carefully cut some away until it doesn't block any light. It may look ugly, but it may be better than no hood.
Use the lens without a hood. Keep the sun at your back. Use anything handy to shade the lens: walls, columns, trees, anything. It works.