Check the number stamp on the plug of your E4. If it's a 3 number (xyz) stamp, then it was made the xy week of year z. If it's a 4 number (wxyz) stamp, then it was made the wxy day of year z. I don't think you need the receipt if you have a stamp that says you're still within the 2-year warranty period. If you are out of the 2-year warranty period (going by the date stamp on the plug) and you lost your receipt, you can still try, Shure has great CS.
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Portable rig: Cowon D2 -> Cheap Buds
PC rig: Asus P6T motherboard optical out -> Apogee Mini-DAC USB -> Meier Audio Corda Cantate -> Sennheiser HD650
CDP rig: Arcam CD73 -> Apogee Mini-DAC USB -> Meier Audio Corda Cantate -> Sennheiser HD650
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