A pair of pictures purporting to be from the "iPhone 8" wireless charging feature are clearly too large to be internal parts, but could possibly be part of the device's external charging pad.
The images, first spotted on Weibo, have no clear Apple markings on the electronics other than a sticker claiming that the part is an EVT — or "engineering validation test." While the original poster claims that they are internal parts to the "iPhone 8" itself — it is clear that they are not, and are too large.
The first image has a QR code in the bottom right. Assuming the QR code is as small as 5mm, it clearly means that the component is too large to fit inside the iPhone 7 Plus.
The second image appears to be of the same component, just the opposite side. The port on the right hand side of the device, scaled for Lightning, USB-C, or microUSB still makes the component wider than an iPhone 7 Plus — which is thought to be larger than the "iPhone 8."
Additionally, the markings on the chips have been eradicated by photo editing tools. Had the poster wished to allow viewers to make a better identification of the device, this additional step would not have been taken.