How to identify furniture sets

How does one find the name or make or model or manufacturer or whatever, of a furniture set?
For instance, I have a bed and dresser from a bedroom set, and would like to pick up the other pieces.
But I don't know where it came from or if it's even manufactured recently.
Do furniture companies stamp a serial number or something on the bottom of the bed, or in a dresser drawer?
Where do you think I can find this?
THank you!

Unless there is a brand stamp somewhere on one of the pieces, you're pretty much out of luck.