After I wash my yeast I refill at least 5 vials...and toss out even more every batch.
I did 8 vials of 3068 Weihenstephan Weizen yeast last night.
I currently have 70 (yes, that's SEVEN-ZERO) vials of yeast in my fridge...so, yes, you can reuse them...
Peel the labels off for sending back to White Labs...they don't want the vials back and will accept only the labels...saves on postage too...
Soak the vials in water and the paper will scrape right off using only your finger. Once dried the glue will be VERY sticky. You can get this off using GOOP and an old sock.
I wash them in soapy water afterwards to get rid of the GOOP solvent.
I sanitize them in StarSan and refill using a sanitized funnel.
I also took a 2X4 and measured (I forget the measurement) 2 rows all the way down and 28 lines across. Then I took a 1 1/4 in (I think) blade bit and used a drill press to keep the holes straight. I had to use a round sand paper bit to enlarge the hole slightly while making it smooth. The vials fit nicely.
Here's an (old) pic of the 2X4 with some yeast in it...it's full and I have another container with many more vials on a shelf.