From a compositing point of view when it comes to images being changed to B&W...
Personally, I would take a very good close look at the images. There are ways to tell if an image has been altered from colour to black and white.
1. Chromatic Aberation (this is the kind of green/pinky shift in colour on edges of high contrast) If there is no appearance of this, then it has been altered.
2. Global Illumination is where colour from one source adds colour to another surface. Eg. If you put an egg onto a green table, there will be a cast of green from the table onto the egg's surface, making the egg appear greenish where it is affected. If the image is black and white, you will see no colour bleeding. Given that this photo appears to have been shot on a white sofa, then only point 1 can be checked at this point.
3. If you have the ability to do so, if you check the colour make up of the image itself, greys will always show in RGB as eg, 150 150 150 (+/- a couple of points due to colour management profiling). If there was colour in the shot, even a grey would appear as 146 157 150 (this would represent the casts of colour from light sources or other surfaces).
4. Most homes have fluorescent lights, and without colour correction, will always give the image a green tinge.
Only a professional can compensate for all these anomolies.
I understand that not all people can know this or check this, but atleast by knowing, you have a better chance of not being scammed.
If you are concerned about a post and are not sure, drop me a PM and I will check it out for you
