Warren Brown received a very peculiar visitor two weeks ago in his car-repair shop, the visitor seemed to be a male by judging from his voice, he was wearing a black jacket, a white mask, leather gloves and brown boots. The visitor inquired "Do you remember?" in a very stirred tone - Warren was greatly confused and replied, "Remember what?".
Warren is a 62 year old car repairer with two sons and two daughters; All of them are adults. Warren is a rather busy man, with free time almost impossible to acquire even on the weekends. His children love him more than anything else, and he does love them too by an equal amount.
On that day however, Warren was not very busy. He went to the shop directly from home and sat around the office with nothing to do except play darts. Warren at first had a very stimulating thought which made him expect something astonishing but he later forgot about it.
Anyways, on that conversation with the visitor; The visitor displayed a visible grin and remarked, "Here, take this. Open it 30 minutes after your clock reaches 11:30pm" and handed him a red box, which felt heavy and the visitor left the shop.
After Warren did what the visitor asked, he was surprised and got very happy.
What was in the box and who was this strange visitor?