Im doing a similar thing for a man in a CH on a DIY theme.
You have to be careful not to put in anything that has a sharp edge or anything that could possibly used as a weapon. Just to give you an idea I have bought a plastic box of the sort that men actually use as a tool box and and so far have filled it with realistic looking plastic tools, wing nuts, a folding wooden rule and brightly coloured plastic wall plugs.
What about plastic/wood gardening "tools" like this?
https://www.amazon.co.uk/Esschert-D...=1461866315&sr=8-48&keywords=garden+tools+toy. Add empty seed packets, small plastic flower pots and a small plastic dibber.
For the cheffy stuff - how about a wooden spoon, plastic spatula or icing bag.
Its worth looking at gardening centres and kitchen shops and look at things with an eye to - is it safe? is it small enough to fit? Realistic childrens toys work quite well.