Sorry to hear about your dilemma
You should be able to find similar resin wicker material, although it might not be that easy. Couple of suggestions:

- Try this basket/caning supply sites listed here:

- See if you can identify the manufacturer, as as sign of goodwill, they might actually be willing to help if you contact them and let them know what has happened.

- Check with a furniture store that sells good quality outdoor furniture. They’ll surely be able to point you towards a couple of resources in the industry that might be able to provide the supplies.

Hope this helps!