contacts etiquette

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another question ...i'm such a noob lol

if one of my sellers send me the same info on an address. do i tell the other that i already received the info. did that make sense? if not e.g. seller A sends property listed as 88k then seller B sends for 94k who obviosly has it under contract to buy in 30days from A. Do I tell seller B that I know or just say I'm not interested. thanks guys!!