I found 3 of my videos in this Thief portfolio
https://www.shutterstock.com/g/Syed+Haseeb+Abbas+Shah/video

Also spent some time and managed to find a few videos stolen from other contributors

Stolen: https://www.shutterstock.com/video/clip-1103692199-aerial-view-orlando-florida
Original: https://www.shutterstock.com/video/clip-13736174-windermere-florida-near-dr-phillips-2015
Original: https://www.istockphoto.com/video/orlando-florida-aerial-view-gm543025772-98739383

Stolen: https://www.shutterstock.com/video/clip-1106200463-shield-icon-cyber-security-digital-data-network
Original: https://www.shutterstock.com/video/clip-1075716899-cyber-security-concept-shield-keyhole-icon-on

Stolen: https://www.shutterstock.com/video/clip-1105906211-cyber-security-digital-data-network-protection-shield
Original: https://www.shutterstock.com/video/clip-1088416035-cyber-security-digital-data-network-protection-shield

Stolen: https://www.shutterstock.com/video/clip-1104937557-falling-american-us-dollar-notes-loop-money
Original: https://www.shutterstock.com/video/clip-1082284915-dollar-bills-falling-above-stacks-banknotes-fill

Stolen: https://www.shutterstock.com/video/clip-1103692085-aerial-view-downtown-orlando-florida
Original: https://www.istockphoto.com/video/orlando-florida-aerial-view-gm543025754-98737219

Stolen: https://www.shutterstock.com/video/clip-1104609841-happy-children's-day-beautiful-colorful-lettering-%22
Original: https://www.istockphoto.com/video/children-day-flag-waving-gm1325068810-410206852

Stolen: https://www.shutterstock.com/video/clip-1103156813-mars-planet-animation-green-screen-close-world
Original: https://www.shutterstock.com/video/clip-1069139038-mars-planet-spinning-rotation-green-screen-background

Stolen: https://www.shutterstock.com/video/clip-1103694051-amazing-best-deal-sale-offer-motion-graphics
Original: https://www.shutterstock.com/video/clip-1077752453-best-besl-banner-offer-promotion-super-sale

Stolen: https://www.shutterstock.com/video/clip-1104934631-real-velvet-cloth-stage-silk-red-curtain
Original: https://www.shutterstock.com/video/clip-1038669596-cloth-stage-red-curtain-open-on-green

Stolen: https://www.shutterstock.com/video/clip-1103602569-tv-studio-news-newsroom-blue-background-broadcasts
Original: https://www.shutterstock.com/video/clip-1061885686-virtual-news-studio-set-green-screen

These are just some examples, and almost all videos i that portfolio were stolen from other contributors...