Rotting seeds

I recieved some 626 Sawtelle on a charity auction.  I put them in a wet paper towel and ziplock bag and put on top of the fridge for heat.  Two of the seeds seem to have rotted.  One just had a black spot on the seed coat but the other one was fuzzy,moldy,  and black.  I disgarded these seeds & put the three others in another towel/bag. Was this likely due to the plant not being able to get through the seed coat?I filed all seeds but I didnt file then at the apex really well.  
 
Also The seeds were tan in color and of nice size but a couple of them were lighter colored at the round end.  Is that immature seeds?   Will they likely be ok?
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