How to find similar numeric or alphanumeric in millions of record

 I have a issue , i have a packet_no of 10 to 12 digits (Number may be numeric or alphanumeric ) ,    this   packet when reaches its destination then due to bad scan one or two digits of original  is changed . 

 So my issue is that, how I should find mismatched packet_no in millions of record. 

 My matching condition is date range and store_no where the packet is going. 

Any help is highly appreciated 

Thanks & regards

Rohit