Sand Play Frame Outdoor Sandbox Assembly Type

I purchased this new and unused item here, assembled it, and placed it where I intended to install it, but it didn't fit, so I immediately removed it and put it back in the box. When I placed the frame, sand got on it, and even after brushing, some remains that I couldn't remove. I believe it will be fine if used outdoors, but please be aware of this.
Otherwise, it's close to new.
Thank you very much.

Sandpit
Garden
Play equipment