By following ways you can get silver fragment coins !
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1) Dismantle all your extra items like outfits/caps/shoes/glasses/masks/muffs and etc..etc..
2) Now you can directly purchase Silver Fragment Coins from shop by exchanging BP points. SHOP>BP
3) In time limited events dont redeem for time limited outfits (It does not means anything). Try to redeem first in classic crate coupon scaraps and when you reaches limits then try to redeem it in exchange of BP points box or some heros crates which means you can dismantle those outfits and get silver fragment coins for free !