[JRTJH]

I think most people would say "only reuse a grease seal in an emergency"... That said, you can only inspect the inner bearing if you remove the grease seal, so there's a very good probability that you'll damage the seal and need to replace it. I wouldn't even start the job without having all the parts needed on hand. That said, if you have new grease seals in a bag on the workbench, why even consider using the old ones? At $2.50 each, it's a very small investment.

Years ago, I learned to repack bearings and replace brake shoes on a 1950 Chevy "turtleback coupe". Sitting on a Pepsi crate with an old cardboard box as my workbench, my Dad's words still are as vivid now as back then, "Boy, when you remove the grease seal, throw it away, never reuse one, they are too cheap to reuse and doing so will cost you more in the long run."