Suggestions on remembering where I put something of value?

I am going crazy over where I put a box of my mother’s treasured possessions including some jewelry, paperwork and momentos of the past that are irreplaceable. Here goes the story: I took the box to my house from her house when she went to a nursing home after a stroke. I enjoyed looking at the jewelry and the various photos in the box. It was something that I felt was precious! We put an ADT security system in her house so when my husband and I were going away for Christmas for 2 days, I went to her house and put the box in a box under a box of games in her attic- I know it sounds weird. I thought if someone happened to break into her house they would not look there and ADT would alert the police. I am sure I hid the box where I said as I sent myself an email saying where I put it. When we returned, there was a blizzard and life got a bit hectic. In the weeks after mom’s death in early January, we began the task of cleaning out the attic as mom’s house had to be put up for sale. I know I put a lot of momentos and family albums, things I want to keep into a second locked attic which I have not thoroughly searched although I am not sure if I brought the box back to my own house and hid it somewhere. In April we had an estate sale- the open attic, which I am fairly sure was all cleaned out of valuables by this time, was checked by the estate sale people- who seemed honest. They were looking for a testimonial from me and they gave me valued items they came across when getting ready for the sale. I do not believe they would have stolen the box even if they found it- I am 98% sure the box was not in the unlocked attic anyway. Between Christmas and the sale, mom passed away and my life was in turmoil. I was deeply depressed. I never thought about where the box was until about a month ago- in the interim I was moving along quite well and never thought of it. The box has now become an obsession of mine and all I think of is how stupid I was to move it in the first place when it was safe and secure enough in my own house. I have looked in the unlocked attic – it is not there. I have done a quick search of the locked attic and it is not there. I have searched hiding places in my own home to no avail.
Does anyone have any suggestions? I am almost afraid to go crazy looking as every place I look and do not find it will be another downfall to my hopes of finding it. Sometimes I feel like I have lost my mind- I might add that I am very scattered brainish always losing things which I nearly always find.
I was considering hypnosis but not sure that really works as well as consulting a psychic. Has anyone tried these sorts of things related to lost items?
Any advice on what I should do?