re Winning11, please share pics or links for verification. no one can advise based on that alone. especially if you r talking bout old shirts. You did not mention if its new or used either.

if its current season BNWT, u don need me to tell u. Watever lubang he has wont get that price becose the cost price (to retailers) is already higher than that. don forget he "lubang" already still need to make profit. You do the maths

price is a fairly good indicator. Most "lubangs" if at all are mainly sellers buying from overseas like UK or Singapre where the RRP is lower than here after conversion. So u can check out prices at UK websites or Singapore websites, give and take a little and you will have a rough idea what the reasonable range would be for original shirts. If lower than that then more likely than not its fake.