Composition dealer query

dear colleagues
Happy diwali all
ek client hai mere jo second hand bike purchase kr ke sell krte hai.. turonver approx monthly 4-5 lac hai... ab vo gst me registration krva rhe hai... Lekin purchase k bill toh unke pass hote nhi hai.. toh composition scheme me registred krne k baad bhi unke annual return (GSTR4) me kya inward details show krunga??

regards,