So do you??!!
I don't usually. We received a few things for the kids twice at christmas so they went into my gift box. I tend to love receiving presents!!
Anyway, my mum is a classic regifter but has no system. Often my sister comes over and sees something in my house and it'll be a gift she bought my mum!
Funnily enough my mum loves to tell the story of how she bought a wine book for her sister over east and the next year she received it back again!!