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Your California Wildfires and Straight-line Winds (DR-4856-CA) qualifies as a federally declared disaster. A qualified disaster uses form 4684 to claim the losses.

Since you lost everything, this workbook may help,  Publication 584, Casualty, Disaster, and Theft Loss Workbook (Personal-Use Property)

Yes, you will have to work with the program and choose the 2024 date.

Reference: Publication 547 (2024), Casualties, Disasters, and Thefts

I am very sorry for your loss.