Read the following article and answer the question.

He almost zipped it up but a flash of something yellowish stopped him and he reached in curiously to remove the object . " Oh ... I forgot about this . " He said flipping the manila envelope over to look at the neat kanji printed on the front . He shrugged and shoved it back into his bag . " I 'll just give it back tomorrow ... .if I remember . " He left the room and moved towards the lift .

Why is the narrator reaching into the bag ?
Something yellow caught his attention .