Speaking of Hebrews 1, see the second bulleted point on this post concerning Hebrews 1:1, 2 and "the last days."
Here is something similar regarding James 5:3:
(James 5:3 Old NWT) . . .YOUR gold and silver are rusted away, and their rust will be as a witness against YOU and will eat YOUR fleshy parts. Something like fire is what YOU have stored up in the last days. . .
(James 5:3 rNWT) . . .Your gold and silver have rusted away, and their rust will be a witness against you and will consume your flesh. What you have stored up will be like a fire in the last days.
Compare these NWT renderings above with the renderings of James 5:3 at BibleHub (here).
In both instances (Hebrews 1:1, 2 and James 5:3), the NWT makes a rendering that dilutes the idea of "the last days." The Society holds that the last days don't begin until 1914. The NT writers held to the idea that they were in the last days. The renderings of the NWT on these two verses reflect in a subtle way, the view of the WT in reference to their "last days" doctrine.