I tend to not believe it's truly 50k, but even 1/2 of that capacity and it's worth it:
I'm sure it's not either but at least it's a large unit to believe 1/2 of the mAh.
So I'm thinking you got the pink one of course? (luckily you're 3,000 miles away)
I've been buying the 3-5,000 mAh ones that cost between $12-16.00 from the China sites or ebay China vendors. I always order 10 and use some while giving them to clients. It's a nice giveaway and clients love when they get them. The problem now has been with China & Hong Kong Post banning battery shipments which was inexpensive. Now they have to go special DHL freight and the cost has gone tenfold making it not worth it. I did find some China wholesalers here in the US that must be getting them in by boat in bulk and selling them at the same prices. The shipping is much quicker now too.
Make sure to follow-up how your brick - err I mean Powerbank performs. I believe some nice Pink 6" pumps would go well with it! ;-)))