If my mother has things of mine in her home but won't let me go get them, what do I need to do legally?

Question Details: My father passed away a few years ago and I needed help storing some of his things, so at the time my mother offered to let me put some of them in her house. We don't speak anymore and she's living in another state with her boyfriend but still has her house. What do I need to do legally to obtain my fathers things? He didn't have a Will but I do have a letter from the attorney thy settled his estate, stating that I am the sole heir to all of his possessions.

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