I Witnessed A Small Miracle
Mark, Your friend was just under a lot of stress and likely "misplaces things" typical of someone with ADD/ADHD. When objects like wallets re-emerge from what I call "small object purgatory" (despite looking in that place before, sometimes compulsively looking again & again in that same place) as in your friend's experience, it is likely stress and his subconscious intervening so he literally can't see/find it. He had a subconscious hidden agenda for not seeing it, such as not wanting to spend the money, etc. This used to happen to me when I really did not want to date someone anymore, I'd misplace my wallet or my car keys just before going out, then they would appear right where I "knew" I'd left them. Your friend may have hit the nail on the head about it falling off the chair. (F.Lee Billy's comment on Emotional Times, September 27, 2010.)
Does this explain "Vayiphtach Elokim et eineha, vateira b'eir mayyim"? (Vayeira 21:19) If the well had always existed in that spot, then the miracle was noticing it.
Is it possible that Avraham knew the well was there? Could depression have clouded Hagar's vision until, via prayer, Elokim lifted it?
Could this unexpected appearance of the well be the "miracle" of simply seeing what was already there?