A letter of apology to a friend regarding loss of an item. It offers compensation or replacement of the item, and provides explanation of the loss made.
I am extremely sorry for [not returning / losing] the [ITEM] that I borrowed on [date].
[PROVIDE REASON IF ANY - e.g. I have taken it home by mistake and have somehow misplaced it. / I lost it on my way home. / I did not realised that I need to return it due to [reason] and have disposed of it.]
[I made several efforts to recover the [ITEM], and I am afraid that it is just gone.] / [I have been looking everywhere for the [ITEM] for the past [week / month] but it was all in vain and I just have to let you know that I have given up my search.]
failure to return,
lost and found,