WW11 yamishita name tag -collar lapel five stars with japanese symbols

Hi
I HAVE HAD THESE ITEMS FOR 7 YEARS I PURCHASED THIS AUSTRALIAN RAAF WALLET FROM A GARAGE SALE IN SYDNEY . INSIDE THE WALLET THERE ARE LEAVE /RAILWAY PASSES FOR A MR/MRS-W.A CROOCKS -UNIT NO.11.T.S RAAF SOMERS (Victoria) NO-2 SECOND SQUADRON 1941 .ALSO INSIDE THE SLEEVES OF THE WALLET IS A NAME TAG YAMISHITA -COLLAR LAPEL WITH 5 STARS WITH JAPANESE SYMBOLS BACK AND FRONT THESE ARE MY LITTLE TREASURES I WOULD JUST LIKE TO KNOW FROM SOME WHAT THEY ARE ESPECIALLY THE THE LAPEL AND NAME TAG