|The clasp was broken|
This morning I came up with a brainwave - VELCRO!!
So I found my velcro sticky pads (about 1cm accross). Firstly I took off the broken clasp and the handle. I knew velcro would not hold if I tried using the handle at the top and as I am forgetful I took it off.
Then I attached a few velcro to the plastic box - attaching both fluffy and grippy side - then closed the box and pressed down. The grippy side then stuck to the lid of the box file.
Now all I have to do is to decorate it.