Howdy
The Smith and Wesson Forum is where you want to go.
But first, let's identify exactly which 38 S&W Safety Hammerless you have, as there were five slightly different models made over the years. If you know for sure it was made in 1898, it is either a 3rd Model or a 4th Model. The 3rd Model was made from 1890 until 1898, the 4th Model was made from 1898 until 1907. The easiest way to differentiate between the various models of 38 Safety Hammerless models is by how the latch operates. If you can provide a clear, well focused photo of the latch area of the gun, I can probably tell you which model it is. Also, it would be nice to know if it is it blued or nickel plated.
There were wooden display boxes made, but they are going to be rare and expensive. More than you are going to want to spend for a refinished revolver.
Over the years I have been able to pick up a few S&W pocket pistols with their original boxes. They are not all that rare. The closest thing I have with a box to your 38 is this 32 Safety Hammerless that left the factory in 1905.
This is a typical hinged factory box from that era. As with all things S&W, the boxes varied in appearance over the years. S&W revolvers were sold with boxes like this from the late 1870s until the early 20th Century. Made of cardboard and covered with cloth. You can see how the cloth forms the hinge. The color of the cloth varied over the years. Inside there was usually a label like this pasted to the cover describing the model and how to use it.
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The top of this style box was usually plain without any marking. This box is in pretty good shape. The corners often suffered from wear. There was usually a label pasted on one end of the box describing what was inside. I'll see if I can get a shot of the end label later on so you see what they looked like.
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The box for this model is unusual in that it had an illustration of the gun pasted onto the top of the box. The label has a lot of wear on it. This is a 38 Single Action, 1st Model, also known as the Baby Russian.
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This box had a cardboard partition on the inside. There would have been cleaning tools in the partition areas. This one is unusual in that the distributor's name, M.W. Robinson, has been stamped onto the label.
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Anyway, the place you want to go if you want to find a box is the Smith and Wesson Forum.
http://smith-wessonforum.com/forum.php
First go to the Revolver section, then go to the Antiques section. Spend some time browsing around to learn about the different types of Top Breaks.
There is a classified section on the main page. There is a section for Accessories and Misc. for sale or trade. Read the rules, you will probably have to register for the forum. There is a Wanted to Buy section too. Guys are looking for boxes there all the time.