Anything that is intact in the wrapping is fine matey. If the bleed is bad enough to require an emergency care bandage/first field dressing then the sterility of the skin is already majorly compromised and infection is already in there, so slapping on an ECB/FFD (out of date or not) is going to trap environmental detritus inside the wound anyway. The use of the ECB/FFD is to stop Massive Hemmorage (arterial bleed, flayed muscle, degloving and such). Infection of the wound is waaay down the list on priorities in this context. When you get to hospital the doc will IV you with a shed load of antibiotics to fight the later infection that will come from such a big wound, so don't worry.
As an aside, if the knuckle wound required 2 ECBs, I would of removed the first one and packed the wound with gauze before reapplying a fresh ECB if required, rather than slapping on another ECB, which surely was just damn awkward and worrying for the patient? But I wasn't there, so its just my thoughts so I guess irrelevant.....
Also, I've seen some pretty bad muscular flayed wounds wrapped in the casualties sweaty, muddy T-shirt prior to transport to hospital. He was OK, worked for him!
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